I’m glad you’re seeing someone. Just realize it takes time, and YOU have to do the work. If you really feel you aren’t getting anywhere, then you might need to see someone else.
I hope you’re able to find help. Being so “stuck” must be painful, and it might be a bit scary for the other person. I know it won’t make any difference, but are you at all able to see this from her side? Your desperation to get her back isn’t healthy at all. You see it as love, but it’s reached a point of obsession, and no one wants to be on the other end of that.
This is NOT about having ADHD. You’ve got some other issues going on that require some serious intervention. I hope the psychiatrist is able to prescribe something to calm you down and give you some relief. That might be why you don’t think therapy is helping as much as it should.
Good luck to you.